From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: catalin.marinas@arm.com, devicetree@vger.kernel.org,
bcm-kernel-feedback-list@broadcom.com,
linux-rpi-kernel@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Eric Anholt <eric@anholt.net>, Stefan Wahren <wahrenst@gmx.net>
Cc: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
linux-kernel@vger.kernel.org
Subject: [PATCH 1/2] ARM: dts: bcm2711: force CMA into first GB of memory
Date: Mon, 4 Nov 2019 14:54:11 +0100 [thread overview]
Message-ID: <20191104135412.32118-2-nsaenzjulienne@suse.de> (raw)
In-Reply-To: <20191104135412.32118-1-nsaenzjulienne@suse.de>
arm64 places the CMA in ZONE_DMA32, which is not good enough for the
Raspberry Pi 4 since it contains peripherals that can only address the
first GB of memory. Explicitly place the CMA into that area.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
index cccc1ccd19be..3c7833e9005a 100644
--- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
+++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
@@ -19,6 +19,25 @@
reg = <0 0 0>;
};
+ reserved-memory {
+ #address-cells = <2>;
+ #size-cells = <1>;
+ ranges;
+
+ /*
+ * arm64 reserves the CMA by default somewhere in ZONE_DMA32,
+ * that's not good enough for the Raspberry Pi 4 as some
+ * devices can only address the lower 1G of memory (ZONE_DMA).
+ */
+ linux,cma {
+ compatible = "shared-dma-pool";
+ size = <0x2000000>; /* 32MB */
+ alloc-ranges = <0x0 0x00000000 0x40000000>;
+ reusable;
+ linux,cma-default;
+ };
+ };
+
leds {
act {
gpios = <&gpio 42 GPIO_ACTIVE_HIGH>;
--
2.23.0
next prev parent reply other threads:[~2019-11-04 13:54 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-04 13:54 [PATCH 0/2] arm64: Fix CMA/crashkernel reservation Nicolas Saenz Julienne
2019-11-04 13:54 ` Nicolas Saenz Julienne [this message]
2019-11-04 17:09 ` [PATCH 1/2] ARM: dts: bcm2711: force CMA into first GB of memory Stefan Wahren
2019-11-04 17:19 ` Nicolas Saenz Julienne
2019-11-04 17:51 ` Florian Fainelli
2019-11-04 18:48 ` Florian Fainelli
2019-11-04 18:53 ` Nicolas Saenz Julienne
2019-11-05 14:51 ` Catalin Marinas
2019-11-05 22:04 ` Stefan Wahren
2019-11-04 13:54 ` [PATCH 2/2] arm64: mm: reserve CMA and crashkernel in ZONE_DMA32 Nicolas Saenz Julienne
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